st: which -cmp- option to use for poisson model with count data?

Dear Stata users
Can -cmp- be used with count data, which would normally be estimated
using -poisson- in Stata? For example, the number of experts, ranging
from 0 to 5 in the data (but theoretically limited to >0) .
As this variable would be truncated (at 0, right truncated), I suppose
I should use the option -indicator($cmp_trunc)- when using -cmp-?
For example
*---------------------------- Stata example begin---------------------
cmp (experts=x1 x2 x3, trunc(0 .)), indicators($cmp_trunc)
*------------------------- Stata example end------------------------
would this be correct?
Thank you very much for your consideration.
Laura
*
* For searches and help try:
* http://www.stata.com/help.cgi?search
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/